Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fd5c40de8c774e…

MALICIOUS

PDF

68.8 KB Created: 2020-12-03 14:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b63773fd50cd47d1904a6e2b130f720e SHA-1: 38b7b3cf58ce197fd573c7f808b4cc9c84149390 SHA-256: b7fd5c40de8c774e95d46f94c8bc772f834721b73eeb803c18a2cf7144d3254b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a "permit test cheat sheet", suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/aws?utm_term=ca+dmv+permit+test+cheat+sheet In PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/nabobu_panozid_xopesatiju.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/3afc7b8.pdfIn PDF document text
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/bosawovepak_komitav_dikumoje_velizujiped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5fbaabbb5f525.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9cf21e-142e-4bad-9746-a7c69061eefa/telecharger_internet_download_manager_gratuit_avec_crack_pour_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2304df36-333a-406f-b2b7-3e7950bca1cc/petubokipulelizetopukimop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58a2878-f53b-46ec-9825-109c0fe5108a/moresulitasomowete.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/3654430911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b300f3a-eb41-4f06-9f22-7057180f6fd1/banjo_kazooie_walkthrough_mad_monster_mansion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28d4e3d-3857-4be0-8f16-5cac97eb9cfd/rididotixakonorik.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/94782940828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03acdba-1dda-4793-9180-ed21420626a1/xizasirofiberujodolu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 5248 bytes
SHA-256: 74fc6f5d7c6ccd37e38aa65851a3b096f1ef37162adf94432b78f129215ff53f
font_01_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 10972 bytes
SHA-256: ed8af6a019f72f1ae133cd69b119742e91ca4c1f6eb79655ce85ce18b25f6813

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